Light bulb



FIG. 1 is a front perspective view showing a light bulb of the presentinvention;

FIG. 2 is a front view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

In the drawings, the broken line showings are for the purpose ofillustrating portions of a light bulb or environmental structure andforms no part of the claimed design.

CLAIM The ornamental design for a light bulb, as shown and described.